In D&D Adventurers League, I know that DMs can do the following for encounter scaling:
- Add or remove monsters from an encounter
- Adjust monster HP
because the modules usually have scaling instructions that include these things (and it doesn't say you have to use the formula in the module to determine which level to run at). But can DMs also adjust other monster stats? For instance, can a DM change e.g. the speed or AC of a monster?